 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.texteditor;

 /**
  * Extension interface for {@link org.eclipse.ui.texteditor.ITextEditor}. Adds
  * the following functions:
  * <ul>
  * <li>modifiable state of the editor's input</li>
  * <li>validate state of editor input</li>
  * </ul>
  *
  * @since 2.1
  */
 public interface ITextEditorExtension2 {

     /**
      * Returns whether the editor's input can be persistently be modified.
      * This is orthogonal to <code>ITextEditorExtension.isEditorInputReadOnly</code> as read-only elements may be modifiable and
      * writable elements may not be modifiable. If the given element is not connected to this document
      * provider, the result is undefined. Document providers are allowed to use a cache to answer this
      * question, i.e. there can be a difference between the "real" state of the element and the return
      * value.
      *
      * @return <code>true</code> if the editor input is modifiable
      */
     boolean isEditorInputModifiable();

     /**
      * Validates the state of the given editor input. The predominate intent
      * of this method is to take any action probably necessary to ensure that
      * the input can persistently be changed.
      *
      * @return <code>true</code> if the input was validated, <code>false</code> otherwise
      */
     boolean validateEditorInputState();

 }

